US Patent No: 5,625,413

Number of patents in Portfolio can not be more than 2000

Video camera with a function to correct defective pixels of solid state image pickup device and method of correcting defective pixels of solid state image

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Importance

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Abstract

When defective pixels of a solid state image pickup device of a video camera are corrected by signal processes, a white spot noise is detected by closing an iris and by comparing the signal level and a level of only a dark current. Further, in this case, a gain of an AGC circuit for controlling a gain of a video signal is raised and a precise detection is executed. By executing such a detecting operation at the time of turn-on or turn-off of a power source, the user is not annoying. In the ordinary photographing, a reference level in detection of a white spot noise is set to an optimum value in accordance with a temperature of the solid state image pickup device or its peripheral temperature or the gain of the AGC circuit so that the white spot noise detection is not influenced by the temperature of the solid state image pickup device or the operating state of the AGC circuit.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
HITACHI, LTD.TOKYO32155

International Classification(s)

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  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Itoh, Kenji Tokyo, JP 137 1526
Katoh, Minoru Akiruno, JP 18 115
Ohtsubo, Hiroyasu Yokohama, JP 27 276

Cited Art

Patent Info (Count) # Cites Year
 
SONY CORPORATION (3)
5,144,446 Image defect correcting circuit for a solid state imager 27 1991
5,272,536 Dark current and defective pixel correction apparatus 46 1991
5,416,516 Solid-state image pickup apparatus having a defect detecting mode 59 1993
 
RCA Corporation (2)
4,481,539 Error correction arrangement for imagers 16 1983
4,654,714 Pixel addressing system 24 1985
 
Beckman Instruments, Inc. (1)
4,279,510 Spectrophotometer with improved photomultiplier tube dark signal compensation 6 1979
 
EASTMAN KODAK COMPANY (1)
5,047,861 Method and apparatus for pixel non-uniformity correction 132 1990
 
Ikegami Tsushinki Co., Ltd. (1)
4,410,915 Apparatus for protecting an image pickup tube in a television camera 11 1982
 
MITCHAM GLOBAL INVESTMENTS LTD. (1)
5,047,863 Defect correction apparatus for solid state imaging devices including inoperative pixel detection 35 1990
 
NIKON CORPORATION (1)
5,008,757 Electronic still camera 13 1989

Patent Citation Ranking

Forward Cites

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7,340,109 Automated statistical self-calibrating detection and removal of blemishes in digital images dependent upon changes in extracted parameter values 12 2003
7,315,658 Digital camera 10 2003
7,310,450 Method of detecting and correcting dust in digital images based on aura and shadow region analysis 10 2003
7,308,156 Automated statistical self-calibrating detection and removal of blemishes in digital images based on a dust map developed from actual image data 17 2003
7,206,461 Digital image acquisition and processing system 18 2003
 
DIGITALOPTICS CORPORATION EUROPE LIMITED (6)
6,035,072 Mapping defects or dirt dynamically affecting an image acquisition device 119 1997
7,590,305 Digital camera with built-in lens calibration table 3 2004
7,536,060 Automated statistical self-calibrating detection and removal of blemishes in digital images based on multiple occurrences of dust in images 4 2008
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7,545,995 Automated statistical self-calibrating detection and removal of blemishes in digital images dependent upon changes in extracted parameter values 3 2008
8,369,650 Image defect map creation using batches of digital images 0 2010
 
PANASONIC CORPORATION (3)
7,528,871 Imaging device that prevents loss of shadow detail 4 2004
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APTINA IMAGING CORPORATION (2)
6,654,054 Method and apparatus for canceling the effects of noise in an electronic signal 14 1999
7,489,883 Method for determining temperature of an active pixel imager and automatic correcting temperature induced variations in an imager 4 2004
 
LOGITECH EUROPE S.A. (2)
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7,133,072 Image processing apparatus having an image correction circuit and its processing method 22 2001
 
MINOLTA CO., LTD. (1)
6,630,955 Solid-state image-sensing apparatus with temperature correction and method of calibrating the same 6 2000
 
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SONY CORPORATION (1)
7,479,993 Image device and method for removing noise 1 2002